The CAS number is a unique identification number for chemical substances, which can be used to accurately identify and distinguish different chemical substances. Regarding dispersant, as it is a universal chemical category, there is no specific CAS number. Different types of dispersants have different components and formulas, so each dispersant may have a different CAS number. To obtain the CAS number of a specific dispersant, please provide the specific dispersant product name or chemical composition, and we will do our best to provide you with relevant information.